Fig. 9 | Nature Communications

Fig. 9

From: Multi-scale magnetic mapping of serpentinite carbonation

Fig. 9

Thermodynamic stability of magnetic signal carrier minerals. H2S–O2 activity diagram in the system Fe–O2–H2S showing the stability of native iron, iron oxide and iron sulfide phases as a function of fluid H2S activity and oxygen fugacity. The shaded areas indicate stability of siderite over native iron, iron oxide and iron sulfide phases at fluid CO2 activities corresponding to soapstone (gray field) and listvenite (dark gray field) formation (hexagon symbols in Fig. 3). The magnetite stability field is significantly reduced relative to siderite at a fluid CO2 activity that stabilizes the listvenite assemblage. The diagram was calculated using the computer program Supcrt and thermodynamic database dprons96.dat50. The same diagram calculated for alteration temperatures of 180 °C and 300 °C is included in the supplement (Supplementary Fig. 2)

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